Electric mixer



Sept. 2, 1930. B. GoULD 1,774,509

ELECTRIC MIXER `Filed March 9, 1928 2 Sheets-Sheet l :IIIHIHUIHIIII nufd/ ept. 2, 1930. B. GouLD 1,774,509

ELECTRIC MIXER Filed March 9, 1928 2 Sheets-Sheet 2 cfr" .it 5

IN VEN TOR.

Patented Sept. 2, 1930 UNITED STATES BENJAMIN GOULD, OF BROOKLYN, NEW YORK ELECTRIC MIXER Application lled March 9, 1928. Serial No. 260,356.

The objects of the present invention are to provide simple and practical gearing for electrically operated machines for mixing and beating purposes.

Various other objects of the invention and the novel features of construction, combinations and relations of parts which enable the attainment of all such objects. will appear as the specification proceeds.

The drawings accompanyingr and forming part of this specification illustrate a practical commercial embodiment of the invention, but as such illustration is primarily for purposes of disclosure, it should be understood that the struclulwl may he modiiied and changed without departure from the true spirit and broad scope of the invention as hereinafter defined and claimed.

Figure 1 is a plan view of the complete apparatus.

Figure 2 is a front view of the mixer unit as it appears with the motor unit uncoupled therefrom.

Figure 3 is a side view of the mixer unit, certain parts being indicated in broken lines.

Figure 4 is a vertical sectional view of the transmission unit as on substantially the plane of line 4-4 of Figure 1.

Figure 5 is a vertical sectional view as on line 5 5 of Figure 4.

In Figure 1, the power unit of the apparatus is illustrated as an electric motor 7, mounted on a suitable portable base 8 and connected by flexible universal drive shafting 9, with the transmission head 10 of the mixing unit.

As shown more particularly in Figures 3 and 4, the transmission head isn in the form of a gear casing, having a split clamp 11V 20 sliding on the post and secured by a clamp screw 21. The bowl is shown as mounted in secure. but at the same time, readily detachable relation on the yoke by having horizontal perforated ears 22 at its sides engaging over pointed pins 23 on the ends of the yoke and by having lugs or spring jaws 24 at the back, gripping over the upper and lower edges of the collar or clamp portion 2O of the yoke, Figure 3. The up and down ad- ,iustment of the yoke on the post is limited in the illustration by the stop pins 25, 26, the former being located, as indicated in -Figure 3, to prevent the bowl from contacting with the beater indicated at 27, the dough hook 28 or other implements which may be used in the machine and the lower stop being positioned to support the yoke with the bowl clear of the base, in which latter position it may be readily removed from or slipped into position on the yoke.

The transmission unit comprises in the present disclosure, a horizontal shaft 29 journaled transversely in the casing 10, said shaft having a` drive socket 30 in one end. receiving a corresponding coupling member 31 on the end of the flexible shafting and carrying within the casing`a worm 32` meshing with a worm gear 33 on vertical shaft 34, which latter is coupled by a two-speed transmission gear set with the vertical implement operating shaft 35.

The two-speed transmission gear set is shown in the form of two gears 36. 37, of different sizes fixed on the vertical shaft 34 in mesh with complementary gears 38, 39 on the implement shaft and adapted to be clutched to said shaft by a key 40 which can be shifted by rod 41 into mesh with radial slots 42. 43 in gears 38, 39 respectively. The opposing faces of these last mentioned gears are. shown as having annular recesses 44 forming cooperatively an annular chamber large enough to rccei've the key 40, in which relations of parts. both gears will be declutched and free for rotation without driving shaft 35. A

The clutching rod 41 is shown as set concentrically in the upper end of shaft 35 and as retained in either of the three positions rod. The actual shifting of the rod is effected iii the illustration by means of a linger but- .ton 48 loosely retained von the upper end of the rod between the shoulders 49. For assembly purposes. the key is shown formed as a lug on the upper end of a half-round piece 50 setin a Corresponding recess 51 in the side of the control rod. It will be seen `that when'the control rod is slipped into the in vposition and slide up and down with the 20 rod, the key l-ug projecting out through the key slot 52 cut in the side of the shaft.

In the particular construction shown, a disc 53 is fixed on the lower end of shaft 35, which disc carries an eccentric drive stein 54 for the dough hook 28 and an eccentrically rotating shaft the latter having a planetary pinion 56 on its upper end above the supporting disc meshing with a concentric sun gear 57. By this planetary1 system of gearing the beater shaft is rotated in the course of its travel about the axis ofthe main shaft 35 and the beater is thereby rotated and at the same time carried in a circular orbit within the bowl.

Figures 2 and 3 show bow-different forms of beaters or whips may be mounted on the beater shaft and Figure 3 indicates in addition how when desired. the bread book can be mounted on the fixed stem 54 which simply travels in the orbital path. These various implements may be suitably attached to the stems provided therefor. for instance. by means of the ordinary bayonet joints illus- .trated and comprising pins 5G on'tlie stems to enter bayonet slots 57 in the collars 58 of the iniplenients. the springs 59 on the stems exerting tension to hold the tools properly coupled. The rotating beater stem is r shown larger than the nonrotating hook st em 50 54 to prevent any possibility of the hook being engaged on the beater stem. which latter .might result in injury to the apparatus.

"The dependentl annular flange 60 on the under side of the casingsery-'es as a lguard and cover about the planetary gears and the rotating disc which Vcarries the implementI stems. y l Y A take-off for driving afood chopper. ice cream freezer or the like is shown provided at the front of the transmission unit in the form of a socketed shaft- 61. having a bevel pinion 62 inside the. casing in mesh with a bevel pinion 63 on the upright drive shaft Figure 3 illustrates in bi'oken'flineshow a food chopper 64 may be engaged with a socket 65 to bring the squared end ofthe food chopper shaft into coupledrelation with the squared socket in the take-oil1 shaft. This saine takeoilI may be utilized in similar fashion for driving an ice cream freezer or other piece of ap paratus.

Provision is made for operation of a buffer 66. grinding wheel or-tlie like. as shown particularly in Figures 1, 2 and by gripping the far end of the transverse worm shaft .29 with a screw socket 6T to receive the screw threaded end portion 68 of a stub shaft carrying the wheel or other implement. This gives a direct drive at motor .speed and dnr ing such use of the machine. the clutch key will usually be shifted into the neutral posi" tion to cut out operation of the planetary gea ring and front power take-olf. If desired, however, all these parts may be driven at the same time. The. two-speed gear control enables quick changes in speed to be made for different kinds of beater. relations. A ln the lowered position of the bowl. the implements may be readily coupled and uncoupled and the bowl be removed and replaced. The adjustable mounting of the bowl and transmission units on the standard :ind the adjustable mounting ofthe. standard on the base permit these parts to be set in the most practical and desired relations and to be readily unmounted for packing or ship'- ping purposes. The power take-oft` at motor speed on the side of the transmission case and the front power take-off at reduced sp'eed and which can be driven at either one of two selected speeds.- enable the machine to be used for many useful purposes. rl`he eoupling of the transmission with the motor by flexible shafling is especially advantageous.

mixing or driving enablingr the mixer and the motor each to be v readily used for other purposes when not in operation for driving tbe inixer.

'lhis remote-power, flexible shaft drive has the further advantage of eliminating motor vibration at the mixer. it being possible when desired to place the motor on an entirely separate support from which no vibration can be transmitted to the rest of the apparatns. 'Ilie coupling 69 between the flexible shaftiiig and the transmission may be of the bayonet jointor other readily separable type to enablel the quick connection and disconnection of the two separate units. The motor is shown equipped .with a carrying handle'f) and control switch T1 :is inntters'of convenience in the placing and control of the saine. The' top of the .gear .case is indicated as a. separate cover detachahli secured in place by screws 72 so that the rase may bc readily packed with grease or suitable lubricant for the gears and other parts.

The power take-off end ofthe motor driven ism shaft 29 is illustrated as projecting slightly from the casing and as being knurled to form a gri by which the shaft may be turned with the ngers to line up the coupling elements of the flexible drive shafting.

The invention, it will be seen, is a practical improvement upon and in effect a continuation of my prior Patent 1,707,550.

lVhat is claimed is:

l. In apparatus of the character disclosed. the combination of a gear case and vertically arranged drivingr and driven shafts journaled therein` one of said shafts having a concentric bore therein open through the top of the case and provided with a kcyway slot in one side of the bore. a concentrically disposed control rod entered in said bore and having a loosely rotatable linger knob on the end of the `aine above the top of the case by which said control rod may be shifted longitudinally in the bore of the shaft. a key carried by said control rod and projecting through the lieyivay slot. .said key consisting of a substantiallyY half round piece provided with a lug extending out through the kevway slot and said control rod having a substantially half round seat in the side of the same to receive the suhstantially half round portion of the key. which latter is therebyy held in said seat' by the surrounding Wall of the bore in the shaft. and companion gears on the drivingr and driven shafts. those on the shaft with the bore therein being loose on said shaft but having keywavs to receive the key carried by the control rot 2. In apparatus of the character disclosed. the combination of a gear case and driving and driven shafts journaled therein. one ot' said shafts having a concentric bore therein open to the exterior of the case and provided with a keyivav slot in one side of the. bore. a concentrically disposed control rod entered in said bore and having an actuating handle outside the case b v which said control rod may he shifted longitudinally in the bore of the shaft. a key carried by said control rod and projecting through the ke v\va v .slot and companion gears on the driving and driven shafts. those on the shaft with the. bore therein being loose on said shaft but having keyways to receive the kev carried by the control rod. the control rod having a substantially half-round seat in the side of the saine and the key comprising a substantially half-round piece loosely set in said seat and having a lug portion extending out through the keyivay slot.

3. ln apparatus of the character disclosed, the combination of a gear case, and drivinl and driven shafts journaled therein, one o said shafts having a concentric bore therein open to the exterior of the case and provided with a keyway slot in one side of the bore opening to the exterior of the case, a

concentrically disposed control rod entered in said bore and having an actuating handle outside the case b v which said Control rod may be shifted longitudinally in the bore of the shaft. a key carried by said control rod and projecting through the keyivay slot, companion gears on the driving and driven shafts. those on the shaft with the bore therein being loose on said shaft but having keyways to receive the key carried b v the control rod. a collar detachably secured to the case about the projecting portion of the control rod and overstanding the open end of the keyway to thereby removably retain the ke and control rod in position in the bore of the shaft and spring retaining means for the control rod carried by said collar. the handle means for the control rod comprising a linger button loosely mounted on the control rod adjacent said collar.

l. ln a device of the characterdisclosed, a gear case. a horizontal motor driven shaft in said case. an upright imple-nient operating shaft iouinaled-in the cafe. a second upright .shaft in the case actuated from the motor driven shaft, companion gears on tht upright shalts. one of said upright shafts having a concentric bore in the upper end of the same orcninu` throst'h the top of the case. a con trol rod .shifable lot-gitudinall;y in the bore. of said shaft. clutch means operable bv said control rod to control the gear drive between the upright sha its and a retainer' collar removably sccurcd to the top of the .cas-r over the bore in the shaft and rcmovahlj.' rctaining the control rod in operative relation in 4said bore.

5. ln apparatus ofthe character disclosed. the combination of a gear case. parallel shafts mounted therein and one havin; r a concentric bore in one end open to the exterior of the case and provided ivith a kevwav ,slot in one side of said bore. a control rod entered in said bore and having a substantially half round seat in one side of the same. a key comprising a substantially half round piece loosely set in said seat and having a lug porA tion extending out through the keyway slot. an actuating handle for said control rod for shifting the same with .said kry piece longitudinally in the bore of the shaft and coinpaniorr gears on the shafts. those on the shaft. ivith the bore therein being loose on said shaft but having l\'e vvva vs to receive the key carried by the control rod.

ln testimony whereof T attix mv signature.

BENJAMIN GoULD. 

